migrate projects: create zpool image file of appropriate size, with compression and dedup
migrate projects: create zpool image file of appropriate size, with compression and dedup

tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,sagemathinc/smc,sagemathinc/smc,sagemathinc/smc,DrXyzzy/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc